Wheeky Treat Ball Toy for Guinea Pigs, Rabbits, Hedgehogs and Other Small Pets, 7 cm, Yellow, Adjustable Opening Treat Toy New Fun, interactive treat ball designed to be pushed and rolled by your pet for a great mental and physical workout Great boredom buster for guinea pigs, rabbits, rats, hedgehogs and all small pets - allows pets to entertain themselves and burn off energy Bright yellow color with orange decorative carrots Adjustable treat opening -- Use with kibble, small diced carrot, or dried herbs or fruit - We inspect 100% of all units in USA to insure the open mechanism is not frozen Small size (2.8-inch/7 cm diameter) is just right for small pets